Quectel Wireless Solutions 201605EC25A LTE Module User Manual

Quectel Wireless Solutions Company Limited LTE Module Users Manual

Contents

Users Manual

EC25-A User Manual LTE Module Series Rev. EC25-A_User_Manual_V1.0 Date: 2016-03-28 www.quectel.com
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 1 / 7 Our aim is to provide customers with timely and comprehensive service. For any assistance, please contact our company headquarters: Quectel Wireless Solutions Co., Ltd. Office 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233 Tel: +86 21 5108 6236 Mail: info@quectel.com Or our local office, for more information, please visit: http://www.quectel.com/support/salesupport.aspx For technical support, to report documentation errors, please visit: http://www.quectel.com/support/techsupport.aspx Or Email: Support@quectel.com GENERAL NOTES QUECTEL OFFERS THIS INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION PROVIDED IS BASED UPON CUSTOMERS’ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION. THE INFORMATION SUPPLIED HEREIN IS SUBJECT TO CHANGE WITHOUT PRIOR NOTICE. COPYRIGHT THIS INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF QUECTEL CO., LTD. TRANSMITTABLE, REPRODUCTION, DISSEMINATION AND EDITING OF THIS DOCUMENT AS WELL AS UTILIZATION OF THIS CONTENTS ARE FORBIDDEN WITHOUT PERMISSION. OFFENDERS WILL BE HELD LIABLE FOR PAYMENT OF DAMAGES. ALL RIGHTS ARE RESERVED IN THE EVENT OF A PATENT GRANT OR REGISTRATION OF A UTILITY MODEL OR DESIGN. Copyright © Quectel Wireless Solutions Co., Ltd. 2016. All rights reserved.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 2 / 7 About the Document History Revision Date Author Description V1.0 2016-03-28 Woody WU Initial
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 3 / 7 Contents About the Document ................................................................................................................................... 2 Contents ....................................................................................................................................................... 3 Table Index ................................................................................................................................................... 5 Figure Index ................................................................................................................................................. 6 1 Introduction .......................................................................................................................................... 7 1.1. Safety Information ................................................................................................................... 7 2 Product Concept .................................................................................................................................. 9 2.1. General Description ................................................................................................................ 9 2.2. Directives and Standards ..................................................................................................... 10 2.2.1. FCC Statement ............................................................................................................. 10 2.3. Key Features .......................................................................................................................... 10 2.4. Functional Diagram ............................................................................................................... 12 2.5. Evaluation Board ................................................................................................................... 13 3 Application Interface ......................................................................................................................... 14 3.1. General Description .............................................................................................................. 14 3.2. Pin Assignment ...................................................................................................................... 14 3.3. Pin Description ...................................................................................................................... 16 3.4. Operating Modes ................................................................................................................... 21 3.5. Power Saving ......................................................................................................................... 22 3.5.1. Sleep Mode ................................................................................................................... 22 3.5.1.1. UART Application .............................................................................................. 22 3.5.1.2. USB Application with USB Remote Wakeup Function .................................. 23 3.5.1.3. USB Application with USB Suspend/Resume and RI Function .................... 23 3.5.1.4. USB Application without USB Suspend Function ......................................... 24 3.5.2. Airplane Mode .............................................................................................................. 25 3.6. Power Supply ......................................................................................................................... 25 3.6.1. Power Supply Pins ....................................................................................................... 25 3.6.2. Decrease Voltage Drop ................................................................................................ 26 3.6.3. Reference Design for Power Supply .......................................................................... 27 3.6.4. Monitor the Power Supply ........................................................................................... 28 3.7. Turn on and off Scenarios .................................................................................................... 28 3.7.1. Turn on Module Using the PWRKEY .......................................................................... 28 3.7.2. Turn off Module ............................................................................................................ 30 3.7.2.1. Turn off Module Using the PWRKEY Pin......................................................... 30 3.7.2.2. Turn off Module Using AT Command .............................................................. 30 3.8. Reset the Module ................................................................................................................... 30 3.9. USIM Card Interface .............................................................................................................. 32 3.10. USB Interface ......................................................................................................................... 34
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 4 / 7 3.11. UART Interface ....................................................................................................................... 36 3.12. PCM and I2C Interface ........................................................................................................... 38 3.13. ADC Function ......................................................................................................................... 41 3.14. Network Status Indication .................................................................................................... 41 3.15. STATUS................................................................................................................................... 42 3.16. Behavior of the RI .................................................................................................................. 43 4 GNSS Receiver ................................................................................................................................... 45 4.1. General Description .............................................................................................................. 45 4.2. GNSS Performance ............................................................................................................... 45 4.3. Layout Guideline.................................................................................................................... 46 5 Antenna Interface ............................................................................................................................... 47 5.1. Main/Rx-diversity Antenna Interface ................................................................................... 47 5.1.1. Pin Definition ................................................................................................................ 47 5.1.2. Operating Frequency ................................................................................................... 47 5.1.3. Reference Design ......................................................................................................... 48 5.2. GNSS Antenna Interface ....................................................................................................... 48 5.3. Antenna Installation .............................................................................................................. 50 5.3.1. Antenna Requirement .................................................................................................. 50 5.3.2. Install the Antenna with RF Connector ...................................................................... 50 6 Electrical, Reliability and Radio Characteristics ............................................................................ 53 6.1. Absolute Maximum Ratings ................................................................................................. 53 6.2. Power Supply Ratings ........................................................................................................... 53 6.3. Operating Temperature ......................................................................................................... 54 6.4. Current Consumption ........................................................................................................... 54 6.5. RF Output Power ................................................................................................................... 54 6.6. RF Receiving Sensitivity ....................................................................................................... 55 6.7. Electrostatic Discharge ......................................................................................................... 55 7 Mechanical Dimensions .................................................................................................................... 57 7.1. Mechanical Dimensions of the Module ............................................................................... 57 7.2. Footprint of Recommendation ............................................................................................. 59 7.3. Top View of the Module ........................................................................................................ 60 7.4. Bottom View of the Module .................................................................................................. 60 8 Storage and Manufacturing .............................................................................................................. 61 8.1. Storage.................................................................................................................................... 61 8.2. Manufacturing and Welding ................................................................................................. 61 8.3. Packaging ............................................................................................................................... 62 9 Appendix A Reference ....................................................................................................................... 64 10 Appendix B GPRS Coding Scheme ................................................................................................. 68 11 Appendix C GPRS Multi-slot Class .................................................................................................. 69 12 Appendix D EDGE Modulation and Coding Scheme ..................................................................... 70
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 5 / 7 Table Index TABLE 1: EC25 SERIES FREQUENCY BANDS ........................................................................................ 9 TABLE 2: EC25 KEY FEATURES .............................................................................................................. 10 TABLE 3: IO PARAMETERS DEFINITION ................................................................................................ 16 TABLE 4: PIN DESCRIPTION ................................................................................................................... 16 TABLE 5: OVERVIEW OF OPERATING MODES ..................................................................................... 21 TABLE 6: VBAT AND GND PINS ............................................................................................................... 26 TABLE 7: PWRKEY PIN DESCRIPTION ................................................................................................... 28 TABLE 8: RESET_N PIN DESCRIPTION .................................................................................................. 31 TABLE 9: PIN DEFINITION OF THE USIM INTERFACE .......................................................................... 32 TABLE 10: USB PIN DESCRIPTION ......................................................................................................... 34 TABLE 11: PIN DEFINITION OF THE MAIN UART INTERFACE ............................................................. 36 TABLE 12: PIN DEFINITION OF THE DEBUG UART INTERFACE ......................................................... 36 TABLE 13: LOGIC LEVELS OF DIGITAL I/O............................................................................................. 37 TABLE 14: PIN DEFINITION OF PCM AND I2C INTERFACE .................................................................. 39 TABLE 15: PIN DEFINITION OF THE ADC ............................................................................................... 41 TABLE 16: CHARACTERISTIC OF THE ADC ........................................................................................... 41 TABLE 17: PIN DEFINITION OF NETWORK INDICATOR ....................................................................... 41 TABLE 18: WORKING STATE OF THE NETWORK INDICATOR ............................................................. 42 TABLE 19: PIN DEFINITION OF STATUS ................................................................................................. 43 TABLE 20: BEHAVIOR OF THE RI ............................................................................................................ 44 TABLE 21: GNSS PERFORMANCE .......................................................................................................... 45 TABLE 22: PIN DEFINITION OF THE RF ANTENNA ............................................................................... 47 TABLE 23: THE MODULE OPERATING FREQUENCIES ........................................................................ 47 TABLE 24: PIN DEFINITION OF GNSS ANTENNA .................................................................................. 49 TABLE 25: GNSS FREQUENCY ............................................................................................................... 49 TABLE 26: ANTENNA REQUIREMENTS .................................................................................................. 50 TABLE 27: ABSOLUTE MAXIMUM RATINGS ........................................................................................... 53 TABLE 28: THE MODULE POWER SUPPLY RATINGS ........................................................................... 53 TABLE 29: OPERATING TEMPERATURE ................................................................................................ 54 TABLE 30: CONDUCTED RF OUTPUT POWER...................................................................................... 55 TABLE 31: ELECTROSTATICS DISCHARGE CHARACTERISTICS ....................................................... 56 TABLE 32: RELATED DOCUMENTS ........................................................................................................ 64 TABLE 33: TERMS AND ABBREVIATIONS .............................................................................................. 64 TABLE 34: DESCRIPTION OF DIFFERENT CODING SCHEMES .......................................................... 68 TABLE 35: GPRS MULTI-SLOT CLASSES ............................................................................................... 69 TABLE 36: EDGE MODULATION AND CODING SCHEME ..................................................................... 70
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 6 / 7 Figure Index FIGURE 1: FUNCTIONAL DIAGRAM ........................................................................................................ 12 FIGURE 2: PIN ASSIGNMENT (TOP VIEW) ............................................................................................. 15 FIGURE 3: UART SLEEP APPLICATION .................................................................................................. 22 FIGURE 4: SLEEP APPLICATION WITH USB REMOTE WAKEUP ........................................................ 23 FIGURE 5: SLEEP APPLICATION WITH RI ............................................................................................. 24 FIGURE 6: SLEEP APPLICATION WITHOUT SUSPEND FUNCTION .................................................... 24 FIGURE 7: POWER SUPPLY LIMITS DURING TRANSMIT BURST ....................................................... 26 FIGURE 8: STAR STRUCTURE OF THE POWER SUPPLY .................................................................... 27 FIGURE 9: REFERENCE CIRCUIT OF POWER SUPPLY ....................................................................... 27 FIGURE 10: TURN ON THE MODULE USING DRIVING CIRCUIT ......................................................... 28 FIGURE 11: TURN ON THE MODULE USING KEYSTROKE .................................................................. 29 FIGURE 12: TIMING OF TURNING ON MODULE ................................................................................... 29 FIGURE 13: TIMING OF TURNING OFF MODULE .................................................................................. 30 FIGURE 14: REFERENCE CIRCUIT OF RESET_N BY USING DRIVING CIRCUIT .............................. 31 FIGURE 15: REFERENCE CIRCUIT OF RESET_N BY USING BUTTON .............................................. 31 FIGURE 16: TIMING OF RESETTING MODULE ...................................................................................... 32 FIGURE 17: REFERENCE CIRCUIT OF 8-PIN USIM CONNECTOR ...................................................... 33 FIGURE 18: REFERENCE CIRCUIT OF 6-PIN USIM CONNECTOR ...................................................... 33 FIGURE 19: REFERENCE CIRCUIT OF USB APPLICATION ................................................................. 35 FIGURE 20: REFERENCE CIRCUIT WITH TRANSLATOR CHIP............................................................ 37 FIGURE 21: REFERENCE CIRCUIT WITH TRANSISTOR CIRCUIT ...................................................... 38 FIGURE 22: PRIMARY MODE TIMING ..................................................................................................... 39 FIGURE 23: AUXILIARY MODE TIMING ................................................................................................... 39 FIGURE 24: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC ............................ 40 FIGURE 25: REFERENCE CIRCUIT OF THE NETWORK INDICATOR .................................................. 42 FIGURE 26: REFERENCE CIRCUIT OF THE STATUS............................................................................ 43 FIGURE 27: REFERENCE CIRCUIT OF ANTENNA INTERFACE ........................................................... 48 FIGURE 28: REFERENCE CIRCUIT OF GNSS ANTENNA ..................................................................... 49 FIGURE 29: DIMENSIONS OF THE UF.L-R-SMT CONNECTOR (UNIT: MM) ........................................ 51 FIGURE 30: MECHANICALS OF UF.L-LP CONNECTORS ..................................................................... 51 FIGURE 31: SPACE FACTOR OF MATED CONNECTOR (UNIT: MM) ................................................... 52 FIGURE 32: MODULE TOP AND SIDE DIMENSIONS ............................................................................. 57 FIGURE 33: MODULE BOTTOM DIMENSIONS (BOTTOM VIEW) ......................................................... 58 FIGURE 34: RECOMMENDED FOOTPRINT (TOP VIEW) ...................................................................... 59 FIGURE 35: TOP VIEW OF THE MODULE .............................................................................................. 60 FIGURE 36: BOTTOM VIEW OF THE MODULE ...................................................................................... 60 FIGURE 37: LIQUIDS TEMPERATURE .................................................................................................... 62 FIGURE 38: CARRIER TAPE .................................................................................................................... 63
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 7 / 7 1 Introduction This document defines the EC25 module and describes its air interface and hardware interface which are connected with your application. This document can help you quickly understand module interface specifications, electrical and mechanical details, as well as other related information of EC25 module. Associated with application notes and user guide, you can use EC25 module to design and set up mobile applications easily. 1.1. Safety Information The following safety precautions must be observed during all phases of the operation, such as usage, service or repair of any cellular terminal or mobile incorporating EC25 module. Manufacturers of the cellular terminal should send the following safety information to users and operating personnel and to incorporate these guidelines into all manuals supplied with the product. If not so, Quectel assumes no liability for the customer’s failure to comply with these precautions. Full attention must be given to driving at all times in order to reduce the risk of an accident. Using a mobile while driving (even with a handsfree kit) causes distraction and can lead to an accident. You must comply with laws and regulations restricting the use of wireless devices while driving. Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it is switched off. The operation of wireless appliances in an aircraft is forbidden, so as to prevent interference with communication systems. Consult the airline staff about the use of wireless devices on boarding the aircraft, if your device offers a Airplane Mode which must be enabled prior to boarding an aircraft. Switch off your wireless device when in hospitals, clinics or other health care facilities. These requests are desinged to prevent possible interference with sentitive medical equipment.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 8 / 7 Cellular terminals or mobiles operating over radio frequency signal and cellular network cannot be guaranteed to connect in all conditions, for example no mobile fee or with an invalid SIM card. While you are in this condition and need emergent help, please remember using emergency call. In order to make or receive a call, the cellular terminal or mobile must be switched on and in a service area with adequate cellular signal strength. Your cellular terminal or mobile contains a transmitter and receiver. When it is ON , it receives and transmits radio frequency energy. RF interference can occur if it is used close to TV set, radio, computer or other electric equipment. In locations with potencially explosive atmospheres, obey all posted signs to turn off wireless devices such as your phone or other cellular terminals. Areas with potencially explosive atmospheres include fuelling areas, below decks on boats, fuel or chemical transfer or storage facilities, areas where the air contains chemicals or particles such as grain, dust or metal powders, etc.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 9 / 7 2 Product Concept 2.1. General Description EC25 is a series of FDD-LTE /TDD-LTE /WCDMA/TD-SCDMA/CDMA/GSM wireless communication module with receive diversity, which provides data connectivity on FDD-LTE, TDD-LTE, DC-HSPA+, HSPA+, HSDPA, HSUPA, WCDMA, TD-SCDMA, CDMA, EDGE and GPRS networks. It can also provide GNSS1) and voice functionality2) for your specific application. EC25 contains four variants: EC25-E, EC25-A, EC25-V and EC25-AUT. You can choose the dedicated type based on the region or operator. The following table shows the frequency bands of EC25 series modules. Table 1: EC25-A Frequency Bands 1. 1) GNSS function is optional. 2. 2) EC25 series (EC25-E/EC25-A/EC25-V/EC25-AUT) includes Data-only and Telematics versions. Data-only version does not support voice function, while Telematics version supports it. With a tiny profile of 32.0mm × 29.0mm × 2.4mm, EC25 can meet almost all requirements for M2M applications such as automotive, metering, tracking system, security, router, wireless POS, mobile computing device, PDA phone and tablet PC, etc. EC25 is an SMD type module which can be embedded in applications through its 144-pin pads, including EC25-A FDD-LTE (with Rx-diversity) B2/B4/B12 TDD-LTE (with Rx-diversity) Not supported WCDMA (with Rx-diversity) B2/B5 GSM Not supported GNSS GPS,GLONASS, BeiDou/Compass,Galileo,QZSS NOTES
0LTE Module EC25-A User ManualEC25-A_User_Manual Confidential / Released 10 / 7 80 LCC signal pads and 64 other pads. 2.2. Directives and Standards 2.2.1. FCC Statement Any Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. The outside of final products that contains this module device must display a labelreferring to the enclosed module. This exterior label can use wording such as thefollowing:“Contains Transmitter Module FCC ID: XMR201605EC25A” Any similar wording that expresses the same meaning may be used.2.3. Key Features The following table describes the detailed features of EC25 module. Table 2: EC25 Key Features Feature Details Power Supply Supply voltage: 3.3V~4.3V Typical supply voltage: 3.8VTransmitting Power Class 3 (24dBm+1/-3dB) for WCDMA bands Class 3 (23dBm±2dB) for LTE FDD bands Class 3 (23dBm±2dB) for LTE TDD bands LTE Features Support up to non-CA CAT4 Support 1.4 to 20MHz RF bandwidth Support Multiuser MIMO in DL direction FDD: Max 50Mbps (UL), 150Mbps (DL) TDD: Max 35Mbps (UL), 130Mbps (DL) WCDMA Features Support 3GPP R8 DC-HSPA+ Support 16-QAM, 64-QAM and QPSK modulation 3GPP R6 CAT6 HSUPA: Max 5.76Mbps (UL) 3GPP R8 CAT24 DC-HSPA+: Max 42Mbps (DL) Internet Protocol Features Support TCP/UDP/PPP/FTP/HTTP/SMTP/MMS/NTP/PING/QMI protocols Support the protocols PAP (Password Authentication Protocol) and CHAP (Challenge Handshake Authentication Protocol) usually used for PPP connections SMS Text and PDU mode Point to point MO and MT
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 11 / 7 SMS cell broadcast SMS storage: ME by default USIM Interface Support USIM/SIM card: 1.8V, 3.0V Audio Features Support one digital audio interface: PCM interface WCDMA: AMR/AMR-WB LTE: AMR/AMR-WB Support echo cancellation and noise suppression PCM Interface Used for audio function with external codec Support 8-bit A-law, μ-law and 16-bit linear data formats Support long frame sync and short frame sync Support master and slave mode, but must be the master in long frame sync USB Interface Compliant with USB 2.0 specification (slave only); the data transfer rate can reach up to 480Mbps Used for AT command communication, data transmission, GNSS NMEA output, software debug and firmware upgrade USB Driver: Windows XP, Windows Vista, Windows 7, Windows 8/8.1, Window CE 5.0/6.0/7.0, Linux 2.6 or later, Android 2.3/4.0/4.2/4.4/5.0 UART Interface Main UART: Used for AT command and data transmission Baud rate reach up to 921600bps, 115200bps by default Support RTS and CTS hardware flow control Debug UART: Used for Linux console, log output 115200bps baud rate Rx-diversity Support LTE/WCDMA Rx-diversity GNSS Features Gen8C-Lite of Qualcomm Protocol: NMEA 0183 AT Commands Compliant with 3GPP TS 27.007, 27.005 and Quectel enhanced AT commands Network Indication Two pins including NET_MODE and NET_STATUS to indicate network connectivity status Antenna Interface Including main antenna (ANT_MAIN), Rx-diversity antenna (ANT_DIV) and GNSS antenna (ANT_GNSS) Physical Characteristics Size: 32.0±0.15 × 29.0±0.15 × 2.4±0.2mm Weight: approx. 4.9g Temperature Range Normal operation: -35°C ~ +75°C Restricted operation: -40°C ~ -35°C and +75°C ~ +85°C Storage temperature: -45°C ~ +90°C Firmware Upgrade USB interface RoHS All hardware components are fully compliant with EU RoHS directive
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 12 / 7 2.4. Functional Diagram The following figure shows a block diagram of EC25 and illustrates the major functional parts.  Power management  Baseband  DDR+NAND flash  Radio frequency  Peripheral interface BasebandPMICTransceiverNANDDDR2SDRAMPASwitchLNASwitchANT_MAIN ANT_DIVANT_GNSSVBAT_BBVBAT_RFAPTPWRKEYADCsVDD_EXT USB USIM PCM UARTI2CRESET_N19.2MXOSTATUSGPIOsSAWControlIQ ControlDuplexSAWTxPRx DRx Figure 1: Functional Diagram
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 13 / 7 2.5. Evaluation Board In order to help you to develop applications with EC25, Quectel supplies an evaluation board (EVB), USB data cable, earphone, antenna and other peripherals to control or test the module.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 14 / 7 3 Application Interface 3.1. General Description EC25 is equipped with an 80-pin SMT pad plus 64-pin ground pads and reserved pads that can be connected to cellular application platform. Sub-interfaces included in these pads are described in detail in the following chapters:  Power supply  USIM interface  USB interface  UART interface  PCM interface  ADC interface  Status indication 3.2. Pin Assignment The following figure shows the pin assignment of the EC25 module.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 15 / 7 34335362021222324252627282930313233145672WAKEUP_INAP_READYRESERVEDW_DISABLE#NET_MODENET_STATUSVDD_EXTGNDGNDDBG_RXDDBG_TXDUSIM_PRESENCEUSIM_VDDUSIM_DATAUSIM_CLKUSIM_RSTRESERVED8910111213141516171819545352515049484746454443424140393837727170696867666564636261605958575655USIM_GNDGNDRESET_NPWRKEYGNDRESERVEDPCM_IN※PCM_OUT※PCM_SYNC※PCM_CLK※RESERVEDRESERVEDRESERVEDRESERVEDRESERVEDRESERVEDANT_DIVGNDGNDUSB_VBUSUSB_DMUSB_DPRXDTXDDTRRTSCTSDCDRISTATUSVBAT_BBVBAT_BBVBAT_RFVBAT_RFGNDRESERVEDGNDGNDANT_MAINGNDANT_GNSSGNDADC1RESERVEDI2C_SDAI2C_SCLRESERVEDADC0GNDGNDGND737475767778798081828384100101102106107111112103104109105110899498889397869196859095998792108113RESERVEDRESERVED117126125124123122121120119118127128115 RESERVEDRESERVED116139140138137136135134133132131130129114RESERVEDPower PinsRESERVEDRESERVEDRESERVEDSignal Pins RESERVED PinsGND PinsRESERVEDRESERVED141142RESERVEDRESERVED143144 Figure 2: Pin Assignment (Top View) 1. Keep all RESERVED pins and unused pins unconnected. 2. GND pads 85~112 should be connected to ground in the design, and RESERVED pads 73~84 should not be designed in schematic and PCB decal. 3. “※” means these interface functions are only supported on Telematics version. NOTES
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 16 / 7 3.3. Pin Description The following tables show the EC25’s pin definition. Table 3: IO Parameters Definition Type Description IO Bidirectional input/output DI Digital input DO Digital output PI Power input PO Power output AI Analog input AO Analog output OD Open drain Table 4: Pin Description Power Supply Pin Name Pin No. I/O Description DC Characteristics Comment VBAT_BB 59, 60 PI Power supply for module baseband part. Vmax=4.3V Vmin=3.3V Vnorm=3.8V It must be able to provide sufficient current up to 0.8A. VBAT_RF 57, 58 PI Power supply for module RF part. Vmax=4.3V Vmin=3.3V Vnorm=3.8V It must be able to provide sufficient current up to 1.8A in a transmitting burst. VDD_EXT 7 PO Provide 1.8V for external circuit. Vnorm=1.8V IOmax=50mA Power supply for external GPIO’s pull up circuits. GND 8, 9, 19, 22, 36, 46, 48, 50~54, 56, 72, Ground.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 17 / 7 85~112 Turn on/off Pin Name Pin No. I/O Description DC Characteristics Comment PWRKEY 21 DI Turn on/off the module. VIHmax=2.1V VIHmin=1.3V VILmax=0.5V RESET_N 20 DI Reset the module. VIHmax=2.1V VIHmin=1.3V VILmax=0.5V Status Indication Pin Name Pin No. I/O Description DC Characteristics Comment STATUS 61 OD Indicate the module operating status. The drive current should be less than 0.9mA. Require external pull-up. If unused, keep it open. NET_MODE 5 DO Indicate the module network registration mode. VOHmin=1.35V VOLmax=0.45V 1.8V power domain. If unused, keep it open. NET_ STATUS 6 DO Indicate the module network activity status. VOHmin=1.35V VOLmax=0.45V 1.8V power domain. If unused, keep it open. USB Interface Pin Name Pin No. I/O Description DC Characteristics Comment USB_VBUS 71 PI USB detection. Vnorm=5.0V USB_DP 69 IO USB differential data bus. Compliant with USB 2.0 standard specification. Require differential impedance of 90ohm. USB_DM 70 IO USB differential data bus. Compliant with USB 2.0 standard specification. Require differential impedance of 90ohm. USIM Interface Pin Name Pin No. I/O Description DC Characteristics Comment USIM_GND 10 Specified ground for USIM card. USIM_VDD 14 PO Power supply for USIM card. For 1.8V USIM: Vmax=1.9V Vmin=1.7V Either 1.8V or 3V is supported by the module automatically.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 18 / 7 For 3.0V USIM: Vmax=3.05V Vmin=2.7V IOmax=50mA USIM_DATA 15 IO Data signal of USIM card. For 1.8V USIM: VILmax=0.6V VIHmin=1.2V VOLmax=0.45V VOHmin=1.35V For 3.0V USIM: VILmax=1.0V VIHmin=1.95V VOLmax=0.45V VOHmin=2.55V USIM_CLK 16 DO Clock signal of USIM card. For 1.8V USIM: VOLmax=0.45V VOHmin=1.35V For 3.0V USIM: VOLmax=0.45V VOHmin=2.55V USIM_RST 17 DO Reset signal of USIM card. For 1.8V USIM: VOLmax=0.45V VOHmin=1.35V For 3.0V USIM: VOLmax=0.45V VOHmin=2.55V USIM_ PRESENCE 13 DI USIM card insertion detection. VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. If unused, keep it open. UART Interface Pin Name Pin No. I/O Description DC Characteristics Comment RI 62 DO Ring indicator VOLmax=0.45V VOHmin=1.35V 1.8V power domain. If unused, keep it open. DCD 63 DO Data carrier detection. VOLmax=0.45V VOHmin=1.35V 1.8V power domain. If unused, keep it open.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 19 / 7 CTS 64 DO Clear to send. VOLmax=0.45V VOHmin=1.35V 1.8V power domain. If unused, keep it open. RTS 65 DI Request to send. VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. If unused, keep it open. DTR 66 DI Data terminal ready, sleep mode control. VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. Pull-up by default. Low level wakes up the module. If unused, keep it open. TXD 67 DO Transmit data. VOLmax=0.45V VOHmin=1.35V 1.8V power domain. If unused, keep it open. RXD 68 DI Receive data. VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. If unused, keep it open. Debug UART Interface Pin Name Pin No. I/O Description DC Characteristics Comment DBG_TXD 12 DO Transmit data. VOLmax=0.45V VOHmin=1.35V 1.8V power domain. If unused, keep it open. DBG_RXD 11 DI Receive data. VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. If unused, keep it open. ADC Interface Pin Name Pin No. I/O Description DC Characteristics Comment ADC0 45 AI General purpose analog to digital converter. Voltage range: 0.3V to VBAT_BB If unused, keep it open. ADC1 44 AI General purpose analog to digital converter. Voltage range: 0.3V to VBAT_BB If unused, keep it open. PCM Interface Pin Name Pin No. I/O Description DC Characteristics Comment
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 20 / 7 PCM_IN 24 DI PCM data input. VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. If unused, keep it open. PCM_OUT 25 DO PCM data output. VOLmax=0.45V VOHmin=1.35V 1.8V power domain. If unused, keep it open. PCM_SYNC 26 IO PCM data frame sync signal. VOLmax=0.45V VOHmin=1.35V VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. In master mode, it is an output signal. In slave mode, it is an input signal. If unused, keep it open. PCM_CLK 27 IO PCM clock. VOLmax=0.45V VOHmin=1.35V VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. In master mode, it is an output signal. In slave mode, it is an input signal. If unused, keep it open. I2C Interface Pin Name Pin No. I/O Description DC Characteristics Comment I2C_SCL 41 OD I2C serial clock. Used for external codec. External pull-up resistor is required. 1.8V only. If unused, keep it open. I2C_SDA 42 OD I2C serial data. Used for external codec. External pull-up resistor is required. 1.8V only. If unused, keep it open. RF Interface Pin Name Pin No. I/O Description DC Characteristics Comment ANT_DIV 35 AI Diversity antenna. 50ohm impedance. If unused, keep it open. ANT_MAIN 49 IO Main antenna. 50ohm impedance. ANT_GNSS 47 AI GNSS antenna. 50ohm impedance. If unused, keep it open. GPIO Pins Pin Name Pin No. I/O Description DC Characteristics Comment
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 21 / 7 WAKEUP_IN 1 DI Sleep mode control. VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. Pull-up by default. Low level wakes up the module. If unused, keep it open. W_DISABLE# 4 DI Airplane mode control. VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. Pull-up by default. In low voltage level, module can enter into airplane mode. If unused, keep it open. AP_READY 2 DI Application processor sleep state detection. VILmin=-0.3V VILmax=0.6V VIHmin=1.2V VIHmax=2.0V 1.8V power domain. If unused, keep it open. RESERVED Pins Pin Name Pin No. I/O Description DC Characteristics Comment RESERVED 3, 18, 23, 28~34, 37~40, 43, 55, 73~84, 113~144 Reserved. Keep these pins unconnected. 3.4. Operating Modes The table below briefly summarizes the various operating modes referred in the following chapters. Table 5: Overview of Operating Modes Mode Details Normal Operation Idle Software is active. The module has registered to the network, and it is ready to send and receive data. Talk/Data Network connection is ongoing. In this mode, the power consumption is decided by network setting and data transfer rate. Minimum Functionality Mode AT+CFUN command can set the module entering into a minimum functionality mode without removing the power supply. In this case, both RF function and USIM card will be invalid. Airplane Mode AT+CFUN command or W_DISABLE# pin can set the module entering into airplane mode. In this case, RF function will be invalid.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 22 / 7 Sleep Mode In this mode, the current consumption of the module will be reduced to the minimal level. During this mode, the module can still receive paging message, SMS, voice call and TCP/UDP data from the network normally. Power Down Mode In this mode, the power management unit shuts down the power supply. Software is not active. The serial interface is not accessible. Operating voltage (connected to VBAT_RF and VBAT_BB) remains applied. 3.5. Power Saving 3.5.1. Sleep Mode EC25 is able to reduce its current consumption to a minimum value during the sleep mode. The following section describes EC25’s power saving procedure. 3.5.1.1. UART Application If host communicates with module via UART interface, the following preconditions can let the module enter into the sleep mode.  Execute AT command AT+QSCLK=1 to enable the sleep mode.  Drive DTR to high level. The following figure shows the connection between the module and the host. RXDTXDRIDTRAP_READYTXDRXDEINTGPIOGPIOModule HostGND GND Figure 3: UART Sleep Application  Driving host DTR to low level will wake up the module.  When EC25 has URC to report, RI signal will wake up the host. Refer to Chapter 3.16 for details about RI behavior.  AP_READY will detect the sleep state of host (can be configured to high level or low level detection).
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 23 / 7 Refer to AT command AT+QCFG=“apready” for details. 3.5.1.2. USB Application with USB Remote Wakeup Function If host supports USB suspend/resume and remote wakeup function, the following part will show the sleep application. There are three preconditions to let the module enter into the sleep mode.  Execute AT command AT+QSCLK=1 to enable the sleep mode.  Ensure the DTR is held in high level or keep it open.  The host’s USB bus, which is connected with the module’s USB interface, enters into suspended state. The following figure shows the connection between the module and the host. USB_VBUSUSB_DPUSB_DMAP_READYVDDUSB_DPUSB_DMGPIOModule HostGND GND Figure 4: Sleep Application with USB Remote Wakeup  Sending data to EC25 through USB will wake up the module.  When EC25 has URC to report, the module will send remote wake-up signals to USB BUS so as to wake up the host. 3.5.1.3. USB Application with USB Suspend/Resume and RI Function If host supports USB suspend/resume, but does not support remote wake-up function, the RI signal is needed to wake up the host. The following part will show the sleep application. There are three preconditions to let the module enter into the sleep mode.  Execute AT command AT+QSCLK=1 to enable the sleep mode.  Ensure the DTR is held in high level or keep it open.  The host’s USB bus, which is connected with the module’s USB interface, enters into suspended
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 24 / 7 state. The following figure shows the connection between the module and the host. USB_VBUSUSB_DPUSB_DMAP_READYVDDUSB_DPUSB_DMGPIOModule HostGND GNDRI EINT Figure 5: Sleep Application with RI  Sending data to EC25 through USB will wake up the module.  When EC25 has URC to report, RI signal will wake up the host. 3.5.1.4. USB Application without USB Suspend Function If host does not support USB suspend function, you should disconnect USB_VBUS with additional control circuit to let the module enter into sleep mode.  Execute AT command AT+QSCLK=1 to enable the sleep mode.  Ensure the DTR is held in high level or keep it open.  Disconnect USB_VBUS. The following figure shows the connection between the module and the host. USB_VBUSUSB_DPUSB_DMAP_READYVDDUSB_DPUSB_DMGPIOModule HostRI EINTPower SwitchGPIOGND GND Figure 6: Sleep Application without Suspend Function
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 25 / 7 Opening power switch to supply power to USB_VBUS will wake up the module. You should pay attention to the level match shown in dotted line between module and host. Refer to document [1] for more details about EC25 power management application. 3.5.2. Airplane Mode When the module enters into airplane mode, the RF function does not work, and all AT commands correlative with RF function will be inaccessible. This mode can be set with the following ways. Hardware: The W_DISABLE# pin is pulled up by default; driving it to low level will let the module enter into airplane mode. Software: Command AT+CFUN provides the choice of the functionality level <fun>=0, 1, 4.  AT+CFUN=0: Minimum functionality mode; both USIM and RF function are disabled.  AT+CFUN=1: Full functionality mode (by default).  AT+CFUN=4: Airplane mode. RF function is disabled. 1. The W_DISABLE# control function is disabled in firmware by default. It can be enabled by AT command AT+QCFG=“airplanecontrol”. Refer to document [2] for details. 2. The execution of AT+CFUN command will not affect GNSS function. 3.6. Power Supply 3.6.1. Power Supply Pins EC25 provides four VBAT pins dedicated to connect with the external power supply. There are two separate voltage domains for VBAT.  VBAT_RF with two pins for module RF part.  VBAT_BB with two pins for module baseband part. The following table shows the VBAT pins and ground pins. NOTES NOTE
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 26 / 7 Table 6: VBAT and GND Pins Pin Name Pin No. Description Min. Typ. Max. Unit VBAT_RF 57, 58 Power supply for module RF part. 3.3 3.8 4.3 V VBAT_BB 59, 60 Power supply for module baseband part. 3.3 3.8 4.3 V GND 8, 9, 19, 22, 36, 46, 48, 50~54, 56, 72, 85~112 Ground. - 0 - V 3.6.2. Decrease Voltage Drop The power supply range of the module is from 3.3V to 4.3V. Make sure the input voltage will never drop below 3.3V. The following figure shows the voltage drop during transmitting burst in 2G network. The voltage drop will be less in 3G and 4G networks. VBATTransmit burstTransmit burstMin.3.3VRippleDrop Figure 7: Power Supply Limits during Transmit Burst To decrease voltage drop, a bypass capacitor of about 100µF with low ESR should be used. Multi-layer ceramic chip (MLCC) capacitor can provide the best combination of low ESR. The main power supply from an external application has to be a single voltage source and expanded to two sub paths with star structure. The width of VBAT_BB trace should be no less than 1mm; and the width of VBAT_RF trace should be no less than 2mm. In principle, the longer the VBAT trace is, the wider it will be. Three ceramic capacitors (100nF, 33pF, 10pF) are recommended to be applied to the VBAT pins. The capacitors should be placed close to the VBAT pins. In addition, in order to get a stable power source, it is suggested that you should use a zener diode of which reverse zener voltage is 5.1V and dissipation power is more than 0.5W. The following figure shows the star structure of the power supply.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 27 / 7 ModuleVBAT_RFVBAT_BBVBATC1100uFC6100nFC733pFC810pF++C2100nFC5100uFC333pFC410pFD15.1VFigure 8: Star Structure of the Power Supply 3.6.3. Reference Design for Power Supply The power design for the module is very important, as the performance of the module largely depends on the power source. The power supply is capable of providing sufficient current up to 2A at least. If the voltage drop between the input and output is not too high, it is suggested that you should use a LDO to supply power for module. If there is a big voltage difference between the input source and the desired output (VBAT), a buck converter is preferred to be used as a power supply. The following figure shows a reference design for +5V input power source. The designed output for the power supply is about 3.8V and the maximum load current is 3A. DC_INMIC29302WUIN OUTENGNDADJ2 4135VBAT 100nF 470uF 100nF100K47K470uF470R51K 1%1%4.7K47KVBAT_ENFigure 9: Reference Circuit of Power Supply
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 28 / 7 3.6.4. Monitor the Power Supply You can use the AT+CBC command to monitor the VBAT_BB voltage value. For more details, please refer to document [2]. 3.7. Turn on and off Scenarios 3.7.1. Turn on Module Using the PWRKEY The following table shows the pin definition of PWRKEY. Table 7: PWRKEY Pin Description Pin Name Pin No. Description DC Characteristics Comment PWRKEY 21 Turn on/off the module. VIHmax=2.1V VIHmin=1.3V VILmax=0.5V When EC25 is in power down mode, it can be turned on to normal mode by driving the PWRKEY pin to a low level for at least 100ms. It is recommended to use an open drain/collector driver to control the PWRKEY. After STATUS pin (require external pull-up) outputting a low level, PWRKEY pin can be released. A simple reference circuit is illustrated in the following figure. Turn on pulsePWRKEY4.7K47K≥ 100msFigure 10: Turn on the Module Using Driving Circuit The other way to control the PWRKEY is using a button directly. A TVS component is indispensable to be placed nearby the button for ESD protection. When pressing the key, electrostatic strike may generate from finger. A reference circuit is shown in the following figure.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 29 / 7 PWRKEYS1Close to S1TVSFigure 11: Turn on the Module Using Keystroke The turn on scenario is illustrated in the following figure. VIL ≤ 0.5VVIH ≥ 1.3VVBATPWRKEY≥ 100msRESET_NSTATUS(OD)Inactive ActiveUARTNOTEInactive ActiveUSBTBDTBDTBDFigure 12: Timing of Turning on Module Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is no less than 30ms. NOTE
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 30 / 7 3.7.2. Turn off Module The following procedures can be used to turn off the module: Normal power down procedure: Turn off the module using the PWRKEY pin.Normal power down procedure: Turn off the module using command AT+QPOWD.3.7.2.1. Turn off Module Using the PWRKEY Pin Driving the PWRKEY to a low level voltage, the module will execute power-down procedure after the PWRKEY is released. The power-down scenario is illustrated in the following figure. VBATPWRKEYTBDTBDRUNNING Power-down procedure OFFModuleStatusSTATUS(OD)Figure 13: Timing of Turning off Module 3.7.2.2. Turn off Module Using AT Command It is also a safe way to use AT command AT+QPOWD to turn off the module, which is similar to turning off the module via PWRKEY Pin. Please refer to document [2] for details about the AT command of AT+QPOWD. 3.8. Reset the Module The RESET_N can be used to reset the module. You can reset the module by driving the RESET_N to a low level voltage for time between Treset_min and Treset_max.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 31 / 7 Table 8: RESET_N Pin Description Pin Name Pin No. Description DC Characteristics Comment RESET_N 20 Reset the module. VIHmax=2.1V VIHmin=1.3V VILmax=0.5V The recommended circuit is similar to the PWRKEY control circuit. You can use an open drain/collector driver or button to control the RESET_N. Reset pulseRESET_N4.7K47KTBDFigure 14: Reference Circuit of RESET_N by Using Driving Circuit RESET_NS2Close to S2TVSFigure 15: Reference Circuit of RESET_N by Using Button The reset scenario is illustrated in the following figure.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 32 / 7 VIL ≤ 0.5VVIH ≥ 1.3VVBAT≥Treset_minRESETTINGModule Status RUNNINGRESET_NRUNNING≤Treset_maxFigure 16: Timing of Resetting Module 1. Use the RESET_N only when turning off the module by the command AT+QPOWD and thePWRKEY pin failed.2. Ensure that there is no large capacitance on the PWRKEY and RESET_N pins.3.9. USIM Card Interface The USIM card interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and 3.0V USIM cards are supported. Table 9: Pin Definition of the USIM Interface Pin Name Pin No. I/O Description Comment USIM_VDD 14 PO Power supply for USIM card. Either 1.8V or 3.0V is supported by the module automatically. USIM_DATA 15 IO Data signal of USIM card. USIM_CLK 16 DO Clock signal of USIM card. USIM_RST 17 DO Reset signal of USIM card. USIM_ PRESENCE 13 DI USIM card insertion detection. USIM_GND 10 Specified ground for USIM card. NOTES
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 33 / 7 EC25 supports USIM card hot-plug via the USIM_PRESENCE pin. It supports low level and high level detections, which is disabled by default. For details, refer to document [2] about the command AT+QSIMDET. The following figure shows the reference design of the 8-pin USIM connector. ModuleUSIM_VDDUSIM_GNDUSIM_RSTUSIM_CLKUSIM_DATAUSIM_PRESENCE22R22R22RVDD_EXT51K100nF USIM ConnectorGNDGND33pF 33pF 33pFVCCRSTCLK IOVPPGNDGNDUSIM_VDD15KFigure 17: Reference Circuit of 8-Pin USIM Connector If you do not need the USIM card detection function, keep USIM_PRESENCE unconnected. The reference circuit for using a 6-pin USIM card connector is illustrated in the following figure. ModuleUSIM_VDDUSIM_GNDUSIM_RSTUSIM_CLKUSIM_DATA 22R22R22R100nF USIM ConnectorGND33pF 33pF 33pFVCCRSTCLK IOVPPGNDGND15KUSIM_VDDFigure 18: Reference Circuit of 6-Pin USIM Connector In order to enhance the reliability and availability of the USIM card in your application, please follow the
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 34 / 7 criteria below in the USIM circuit design: Keep layout of USIM card as close as possible to the module. Assure the length of trace is less than200mm.Keep USIM card signal away from RF and VBAT alignment.Assure the ground between the module and the USIM connector short and wide. Keep the width ofground and USIM_VDD no less than 0.5mm to maintain the same electric potential.To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away with each other andshield them with surrounded ground.In order to offer good ESD protection, it is recommended to add TVS which parasitic capacitanceshould not be more than 50pF. The 22ohm resistors should be added in series between the moduleand the USIM card so as to suppress the EMI spurious transmission and enhance the ESDprotection. The 33pF capacitors are used for filtering interference of GSM900. Please note that theUSIM peripheral circuit should be close to the USIM connector.The pull-up resistor on USIM_DATA line can improve anti-jamming capability when long layout traceand sensitive occasion are applied, and should be placed close to the USIM connector.3.10. USB Interface EC25 contains one integrated Universal Serial Bus (USB) transceiver which complies with the USB 2.0 specification and supports high-speed (480Mbps) and full-speed (12Mbps) modes. The USB interface is used for AT command, data transmission, GNSS NMEA sentences output, software debug and firmware upgrade. The following table shows the pin definition of USB interface. Table 10: USB Pin Description Pin Name Pin No. I/O Description Comment USB_DP 69 IO USB differential data bus (positive). Require differential impedance of 90Ω. USB_DM 70 IO USB differential data bus (minus). Require differential impedance of 90Ω. USB_VBUS 71 PI Used for detecting the USB connection. Typical 5.0V GND 72 Ground More details about the USB 2.0 specifications, please visit http://www.usb.org/home. The USB interface is recommended to be reserved for firmware upgrade in your design. The following figure shows the reference circuit of USB interface.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 35 / 7 USB_DPUSB_DMGNDUSB_DPUSB_DMGNDR1R2Close to ModuleR3R4Test PointsESD ArrayNM_0RNM_0R0R0RMinimize this stubModule MCUUSB_VBUSVDDFigure 19: Reference Circuit of USB Application In order to meet USB data line signal integrity, components R1, R2, R3 and R4 must be placed close to the module, and then these resistors should be placed close to each other. The extra stubs of trace must be as short as possible. In order to ensure the USB interface design corresponding with the USB 2.0 specification, please comply with the following principles. It is important to route the USB signal traces as differential pairs with total grounding. The impedanceof USB differential trace is 90ohm.Do not route signal traces under crystals, oscillators, magnetic devices and RF signal traces. It isimportant to route the USB differential traces in inner-layer with ground shielding on not only upperand lower layers but also right and left sides.Pay attention to the influence of junction capacitance of ESD component on USB data lines. Typically,the capacitance value should be less than 2pF.Keep the ESD components as close as possible to the USB connector.EC25 module can only be used as a slave device. NOTE
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 36 / 7 3.11. UART Interface The module provides two UART interfaces: main UART interface and debug UART interface. The following shows the different features. Main UART interface supports 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600bpsbaud rate, and the default is 115200bps. This interface can be used for data transmission and ATcommunication.Debug UART interface supports 115200bps baud rate. It can be used for Linux console and logoutput.The following tables show the pin definition. Table 11: Pin Definition of the Main UART Interface Pin Name Pin No. I/O Description Comment RI 62 DO Ring indicator 1.8V power domain DCD 63 DO Data carrier detection 1.8V power domain CTS 64 DO Clear to send 1.8V power domain RTS 65 DI Request to send 1.8V power domain DTR 66 DI Sleep mode control 1.8V power domain TXD 67 DO Transmit data 1.8V power domain RXD 68 DI Receive data 1.8V power domain Table 12: Pin Definition of the Debug UART Interface Pin Name Pin No. I/O Description Comment DBG_TXD 12 DO Transmit data 1.8V power domain DBG_RXD 11 DI Receive data 1.8V power domain The logic levels are described in the following table.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 37 / 7 Table 13: Logic Levels of Digital I/O Parameter Min. Max. Unit VIL -0.3 0.6 V VIH 1.2 2.0 V VOL 0 0.45 V VOH 1.35 1.8 V The module provides 1.8V UART interface. A level translator should be used if your application is equipped with a 3.3V UART interface. A level translator TXS0108EPWR provided by Texas Instrument is recommended. The following figure shows the reference design. VCCA VCCBOEA1A2A3A4A5A6A7A8GNDB1B2B3B4B5B6B7B8VDD_EXTRIDCDRTSRXDDTRCTSTXD51K 51K0.1uF 0.1uFRI_MCUDCD_MCURTS_MCURXD_MCUDTR_MCUCTS_MCUTXD_MCUVDD_MCUTranslatorFigure 20: Reference Circuit with Translator Chip Please visit http://www.ti.com for more information. Another example with transistor translation circuit is shown as below. The circuit of dotted line can refer to the circuit of solid line. Please pay attention to the direction of connection. Input dotted line of the module should refer to input solid line of the module. Output dotted line of the module should refer to output solid line of the module.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 38 / 7 MCU/ARM/TXD/RXDVDD_EXT10KVCC_MCU 4.7K10KVDD_EXTTXDRXDRTSCTSDTRRI/RTS/CTSGNDGPIO DCDModuleGPIOEINTVDD_EXT4.7KGND1nF1nFFigure 21: Reference Circuit with Transistor Circuit Transistor circuit solution is not suitable for high baud rates exceeding 460Kbps. 3.12. PCM and I2C Interface EC25 provides one Pulse Code Modulation (PCM) digital interface for audio design, which supports the following modes: Primary mode (short sync, works as both master and slave)Auxiliary mode (long sync, works as master only)In primary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising edge; the PCM_SYNC falling edge represents the MSB. In this mode, PCM_CLK supports 128, 256, 512, 1024 and 2048kHz for different speech codecs. In auxiliary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising edge; while the PCM_SYNC rising edge represents the MSB. In this mode, PCM interface operates with a 128kHz PCM_CLK and an 8kHz, 50% duty cycle PCM_SYNC only. EC25 supports 8-bit A-law and μ-law, and also 16-bit linear data formats. The following figures show the primary mode’s timing relationship with 8kHz PCM_SYNC and 2048kHz PCM_CLK, as well as auxiliary mode’s timing relationship with 8kHz PCM_SYNC and 128kHz PCM_CLK. NOTE
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 39 / 7 PCM_CLKPCM_SYNCPCM_OUTMSB LSB MSB125us1 2 256255PCM_INMSBLSBMSB Figure 22: Primary Mode Timing PCM_CLKPCM_SYNCPCM_OUTMSB LSBPCM_IN125usMSB1 2 1615LSB Figure 23: Auxiliary Mode Timing The following table shows the pin definition of PCM and I2C interface which can be applied on audio codec design. Table 14: Pin Definition of PCM and I2C Interface Pin Name Pin No. I/O Description Comment PCM_IN 24 DI PCM data input 1.8V power domain
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 40 / 7 PCM_OUT 25 DO PCM data output 1.8V power domain PCM_SYNC 26 IO PCM data frame sync signal 1.8V power domain PCM_CLK 27 IO PCM data bit clock 1.8V power domain I2C_SCL 41 OD I2C serial clock Require external pull-up to 1.8V I2C_SDA 42 OD I2C serial data Require external pull-up to 1.8V Clock and mode can be configured by AT command, and the default configuration is master mode using short sync data format with 2048kHz PCM_CLK and 8kHz PCM_SYNC. Refer to document [2] about the command AT+QDAI for details. The following figure shows the reference design of PCM interface with external codec IC. PCM_INPCM_OUTPCM_SYNCPCM_CLKI2C_SCLI2C_SDAModule1.8V4.7K4.7KBCLKLRCKDACADCSCLSDABIASMICBIASINPINNLOUTPLOUTNCodec Figure 24: Reference Circuit of PCM Application with Audio Codec 1. It is recommended to reserve RC (R=22ohm, C=22pF) circuit on the PCM lines, especially for PCM_CLK. 2. EC25 works as a master device pertaining to I2C interface. NOTES
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 41 / 7 3.13. ADC Function The module provides two analog-to-digital converters (ADC). Using AT command AT+QADC=0 can read the voltage value on ADC0 pin. Using AT command AT+QADC=1 can read the voltage value on ADC1 pin. For more details of these AT commands, please refer to document [2]. In order to improve the accuracy of ADC, the trace of ADC should be surrounded by ground. Table 15: Pin Definition of the ADC Pin Name Pin No. Description ADC0 45 General purpose analog to digital converter ADC1 44 General purpose analog to digital converter The following table describes the characteristic of the ADC function. Table 16: Characteristic of the ADC Parameter Min. Typ. Max. Unit ADC0 Voltage Range 0.3 VBAT_BB V ADC1 Voltage Range 0.3 VBAT_BB V ADC Resolution 15 bits 3.14. Network Status Indication The network indication pins can be used to drive a network status indicator LED. The module provides two pins which are NET_MODE and NET_STATUS. The following tables describe pin definition and logic level changes in different network status. Table 17: Pin Definition of Network Indicator Pin Name Pin No. I/O Description Comment NET_MODE 5 DO Indicate the module network registration 1.8V power domain
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 42 / 7 mode. NET_STATUS 6 DO Indicate the module network activity status. 1.8V power domain Table 18: Working State of the Network Indicator Pin Name Status Description NET_MODE Always High Registered in LTE network Always Low Others NET_STATUS Flicker slowly (200ms High/1800ms Low) Network searching Flicker slowly (1800ms High/200ms Low) Idle Flicker quickly (125ms High/125ms Low) Data transfer is ongoing Always High Voice calling A reference circuit is shown in the following figure. 4.7K47KVBAT2.2KModuleNetwork Indicator Figure 25: Reference Circuit of the Network Indicator 3.15. STATUS The STATUS pin is an open drain output for indicating the module’s operation status. You can connect it to a GPIO of DTE with pulled up, or as LED indication circuit as below. When the module is turned on normally, the STATUS will present the low state. Otherwise, the STATUS will present high-impedance state.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 43 / 7 Table 19: Pin Definition of STATUS Pin Name Pin No. I/O Description Comment STATUS 61 OD Indicate the module operation status Require external pull-up The following figure shows different design circuit of STATUS, you can choose either one according to your application demands. VDD_MCU10KModuleSTATUS MCU_GPIOModuleSTATUSVBAT2.2K Figure 26: Reference Circuit of the STATUS 3.16. Behavior of the RI You can use command AT+QCFG=“risignaltype”,“physical” to configure RI behavior. No matter which port URC is presented on, URC will trigger the behavior on RI pin. URC can be output from UART port, USB AT port and USB modem port by command AT+QURCCFG. The default port is USB AT port. In addition, RI behavior can be configured flexibly. The default behavior of the RI is shown as below. NOTE
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 44 / 7 Table 20: Behavior of the RI State Response Idle RI keeps high level URC RI outputs 120ms low pulse when new URC returns The RI behavior can be changed by command AT+QCFG=“urc/ri/ring”. Refer to document [2] for details.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 45 / 7 4 GNSS Receiver 4.1. General Description EC25 includes a fully integrated global navigation satellite system solution that supports Gen8C-Lite of Qualcomm (GPS, GLONASS, BeiDou, Galileo and QZSS). EC25 supports standard NMEA-0183 protocol, and outputs NMEA sentences with 1Hz via USB interface by default. By default, EC25 GNSS engine is switched off. It has to be switched on with AT command. For more details about GNSS engine technology and configurations, please refer to document [3]. 4.2. GNSS Performance The following table shows EC25 GNSS performance. Table 21: GNSS Performance Parameter Description Conditions Typ. Unit Sensitivity (GNSS) Cold start Autonomous TBD dBm Reacquisition Autonomous TBD dBm Tracking Autonomous TBD dBm TTFF (GNSS) Cold start @open sky Autonomous TBD s XTRA enabled TBD s Warm start @open sky Autonomous TBD s XTRA enabled TBD s
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 46 / 7 Hot start @open sky Autonomous TBD s XTRA enabled TBD s Accuracy (GNSS) CEP-50 Autonomous @open sky TBD m 1. Tracking sensitivity: the lowest GPS signal value at the antenna port for which the module can keepon positioning for 3 minutes.2. Reacquisition sensitivity: the lowest GPS signal value at the antenna port for which the module canfix position again within 3 minutes after loss of lock.3. Cold start sensitivity: the lowest GPS signal value at the antenna port for which the module fixesposition within 3 minutes after executing cold start command.4.3. Layout Guideline The following layout guideline should be taken into account in your design. Maximize the distance between the GNSS antenna, the main antenna and the Rx-diversity antenna.Digital circuits such as USIM card, USB interface, Camera module, Display connector and SD cardshould be kept away from the antenna.Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanarisolation and protection.Keep 50ohm characteristic impedance for the ANT_GNSS trace.Refer to Chapter 5 for GNSS reference design and antenna consideration. NOTES
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 47 / 7 5 Antenna InterfaceEC25 antenna interface includes a main antenna, an Rx-diversity antenna which is used to resist the fall of signals caused by high speed movement and multipath effect, and a GNSS antenna. The antenna interface has an impedance of 50ohm. 5.1. Main/Rx-diversity Antenna Interface 5.1.1. Pin Definition The main antenna and Rx-diversity antenna pins definition are shown below. Table 22: Pin Definition of the RF Antenna Pin Name Pin No. I/O Description Comment ANT_MAIN 49 IO Main antenna 50ohm impedance ANT_DIV 35 AI Receive diversity antenna 50ohm impedance 5.1.2. Operating Frequency Table 23: The Module Operating Frequencies 3GPP Band Transmit Receive Unit B2 (1900) 1850 ~ 1910 1930 ~ 1990 MHz B4 1710 ~ 1755 2110 ~ 2155 MHz B5 (850) 824 ~ 849 869 ~ 894 MHz B2 1850 ~ 1910 1930 ~ 1990 MHz B12 699 ~ 716 728 ~ 746MHz
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 48 / 7 5.1.3. Reference Design The reference design of ANT_MAIN and ANT_DIV antenna is shown as below. It should reserve a π-type matching circuit for better RF performance. The capacitors are not mounted by default. ANT_MAINR1 0RC1Module MainantennaNMC2NMR2 0RC3Diversity antennaNMC4NMANT_DIVFigure 27: Reference Circuit of Antenna Interface 1. Keep a proper distance between the main antenna and the Rx-diversity antenna to improve thereceiving sensitivity.2. ANT_DIV function is enabled by default. Use the AT command AT+QCFG="diversity",0 can disablereceive diversity.5.2. GNSS Antenna Interface The following tables show the GNSS antenna pin definition and frequency specification. NOTES
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 49 / 7 Table 24: Pin Definition of GNSS Antenna Pin Name Pin No. I/O Description Comment ANT_GNSS 47 AI GNSS antenna 50ohm impedance Table 25: GNSS Frequency Type Frequency Unit GPS/Galileo/QZSS 1575.42 ± 1.023 MHz GLONASS 1597.5 ~ 1605.8 MHz BeiDou 1561.098 ± 2.046 MHz The reference design of GNSS antenna is shown as below. GNSS AntennaVDDModuleANT_GNSS47nH10R 0.1uF100pFNMNMFigure 28: Reference Circuit of GNSS Antenna 1. You can choose an external LDO to supply power according to the active antenna.2. If you design the module with passive antenna, the VDD circuit is not needed.NOTES
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 50 / 7 5.3. Antenna Installation 5.3.1. Antenna Requirement The following table shows the requirements on main antenna, Rx-diversity antenna and GNSS antenna. Table 26: Antenna Requirements Type Requirements GNSS Frequency range: 1561 - 1615MHz Polarization: RHCP or linear VSWR: < 2 (Typ.) Passive antenna gain: > 0dBi Active antenna noise figure: < 1.5dB Active antenna gain: > -2dBi Active antenna embedded LNA gain: 20dB (Typ.) Active antenna total gain: > 18dBi (Typ.) GSM/WCDMA/LTE VSWR: ≤ 2 Gain (dBi): 1 Max Input Power (W): 50 Input Impedance (ohm): 50 Polarization Type: Vertical Cable Insertion Loss: < 1dB (GSM900, WCDMA B5/B8,LTE B5/B8/B12/B13/B20/B28-A/B28-B) Cable Insertion Loss: < 1.5dB (GSM1800, WCDMA B1/B2/B4/,LTE B1/B2/B3/B4) Cable insertion loss < 2dB (LTE B7/B38/B40/B41) 5.3.2. Install the Antenna with RF Connector The following figure is the antenna installation with RF connector provided by HIROSE. The recommended RF connector is UF.L-R-SMT.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 51 / 7 Figure 29: Dimensions of the UF.L-R-SMT Connector (Unit: mm) You can use U.FL-LP serial connector listed in the following figure to match the UF.L-R-SMT. Figure 30: Mechanicals of UF.L-LP Connectors
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 52 / 7 The following figure describes the space factor of mated connector. Figure 31: Space Factor of Mated Connector (Unit: mm) For more details, please visit http://www.hirose.com.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 53 / 7 6 Electrical, Reliability and RadioCharacteristics 6.1. Absolute Maximum Ratings Absolute maximum ratings for power supply and voltage on digital and analog pins of the module are listed in the following table. Table 27: Absolute Maximum Ratings Parameter Min. Max. Unit VBAT_RF/VBAT_BB -0.3 4.7 V USB_VBUS -0.3 5.5 V Peak Current of VBAT_BB 0 0.8 A Peak Current of VBAT_RF 0 1.8 A Voltage at Digital Pins -0.3 2.3 V Voltage at ADC0 0 VBAT_BB V Voltage at ADC1 0 VBAT_BB V 6.2. Power Supply Ratings Table 28: The Module Power Supply Ratings Parameter Description Conditions Min. Typ. Max. Unit VBAT VBAT_BB and Voltage must stay within the 3.3 3.8 4.3 V
0LTE Module EC25-A User ManualEC25-A_User_Manual Confidential / Released 54 / 7 Parameter Description Conditions Min. Typ. Max. Unit VBAT_RF min/max values, including voltage drop, ripple and spikes. Voltage drop during transmitting burst Maximum power control level on GSM900. 400 mV IVBAT Peak supply current (during transmission slot) Maximum power control level on GSM900. 1.8 2.0 A USB_VBUS USB detection 3.0 5.0 5.25 V 6.3. Operating Temperature The operating temperature is listed in the following table. Table 29: Operating Temperature Parameter Min. Typ. Max. Unit Normal Temperature -35 25 75 ºC Restricted Operation -40 ~ -35 75 ~ 85 ºC Storage Temperature -45 90 ºC 6.4. Current Consumption This information will be added in future version of this document. 6.5. RF Output Power The following table shows the RF output power of EC25 module.
0LTE Module EC25-A User ManualEC25-A_User_Manual Confidential / Released 55 / 7 Table 30: Conducted RF Output Power Frequency Max. Min. WCDMA B2/B5 22.5dBm±1dB <-50dBm LTE FDD B2/B4/B12 22dBm±2dB <-44dBm Directives and Standards The EC25-A module is designed to comply with the FCC statements. FCC ID: XMR201605EC25A, TheHost system using EC25-A, should have label indicated "Contains FCC ID: XMR201605EC25A".FCC Radiation Exposure Statement This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator and your body as well as kept minimum 20cm from radio antenna depending on the Mobile status of this module usage. This module should NOT be installed and operating simultaneously with other radio. The manual of the host system, which uses EC25-A must include RF exposure warning statement to advice user should keep minimum 20cm from the radio antenna of EC25-A module depending on the Mobile status.Note: If a portable device (such as PDA) uses EC25-A module, the device needs to do permissive change and SAR testing.
0LTE Module EC25-A User ManualEC25-A_User_Manual Confidential / Released 56 / 7 Table 31: Electrostatics Discharge Characteristics Tested Points Contact Discharge Air Discharge Unit VBAT, GND ±5 ±10 kV All Antenna Interfaces ±4 ±8 kV Other Interfaces ±0.5 ±1 kV
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 57 / 7 7 Mechanical DimensionsThis chapter describes the mechanical dimensions of the module. All dimensions are measured in mm. 7.1. Mechanical Dimensions of the Module (32+/-0.15)(29+/-0.15)0.82.4+/-0.2Figure 32: Module Top and Side Dimensions
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 58 / 7 29.032.0Figure 33: Module Bottom Dimensions (Bottom View)
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 59 / 7 7.2. Footprint of Recommendation Keepout area29.032.0Figure 34: Recommended Footprint (Top View) 1. Pads 73~84 should not be designed.2. In order to maintain the module, keep about 3mm between the module and other components in thehost PCB.NOTES
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 60 / 7 7.3. Top View of the Module Figure 35: Top View of the Module 7.4. Bottom View of the Module Figure 36: Bottom View of the Module
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 61 / 7 8 Storage and Manufacturing8.1. Storage EC25 is stored in a vacuum-sealed bag. The restrictions of storage condition are shown as below. 1. Shelf life in sealed bag is 12 months at < 40ºC/90%RH.2. After this bag is opened, devices that will be subjected to reflow soldering or other high temperatureprocesses must be:Mounted within 72 hours at factory conditions of ≤ 30ºC/60%RH.Stored at <10% RH.3. Devices require bake before mounting, if:Humidity indicator card is >10% when ambient temperature is 23ºC±5ºC.Mounted for more than 72 hours at factory conditions of ≤ 30ºC/60% RH.4. If baking is required, devices may be baked for 48 hours at 125ºC±5ºC.As plastic container cannot be subjected to high temperature, the module needs to be taken out from the container for high temperature (125ºC) baking. If shorter baking time is desired, please refer to IPC/JEDECJ-STD-033 for baking procedure. 8.2. Manufacturing and Welding The squeegee should push the paste on the surface of stencil, so as to make the paste fill the stencil openings and penetrate to the PCB. The force on the squeegee should be adjusted so as to produce a clean stencil surface on a single pass. To ensure the module soldering quality, the thickness of stencil at the hole of the module pads should be 0.18mm. For details, please refer to document [4]. It is suggested that the peak reflow temperature is 235 ~ 245ºC (for SnAg3.0Cu0.5 alloy). The absolute max reflow temperature is 260ºC. To avoid damage to the module when it is repeatedly heated, it is NOTE
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 62 / 7 suggested that the module should be mounted after the first panel has been reflowed. The following picture is the actual diagram which we have operated. Time50 100 150 200 250 30050100150200250160 ºC200 ºC217070s~120s40s~60sBetween 1~3 ºC/sPreheat Heating CoolingºCsLiquids Temperature TemperatureFigure 37: Liquids Temperature 8.3. Packaging EC25 is packaged in tap and reel carriers. One reel is 11.53m length and contains 250pcs modules. The figure below shows the package details, measured in mm.
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 63 / 7 30.3±0.1529.3±0.1530.3±0.1532.5±0.1533.5±0.150.35± 0.054.2±0.153.1±0.1532.5± 0.1533.5± 0.154.00±0.12.00±0.11.75±0.120.20±0.1544.00±0.344.00±0.11.50±0.1Direction of feedCover tape1310044.5+0.20-0.0048.5Figure 38: Carrier Tape
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 64 / 7 9 Appendix A ReferenceTable 32: Related Documents SN Document Name Remark [1] Quectel_EC25_Power_Management_Application_Note EC25 Power Management Application Note [2] Quectel_EC25_AT_Commands_Manual EC25 AT Commands Manual [3] Quectel_EC25_GNSS_AT_Commands_Manual EC25 GNSS AT Commands Manual [4] Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide Table 33: Terms and Abbreviations Abbreviation Description AMR Adaptive Multi-rate bps Bits Per Second CHAP Challenge Handshake Authentication Protocol CS Coding Scheme CSD Circuit Switched Data CTS Clear To Send DC-HSPA+ Dual-carrier High Speed Packet Access DFOTA Delta Firmware Upgrade Over The Air DL Downlink DTR Data Terminal Ready DTX Discontinuous Transmission
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 65 / 7 EFR Enhanced Full Rate ESD Electrostatic Discharge FDD Frequency Division Duplex FR Full Rate GLONASS GLObalnaya NAvigatsionnaya Sputnikovaya Sistema, the Russian Global Navigation Satellite System GMSK Gaussian Minimum Shift Keying GNSS Global Navigation Satellite System GPS Global Positioning System GSM Global System for Mobile Communications HR Half Rate HSPA High Speed Packet Access HSDPA High Speed Downlink Packet Access HSUPA High Speed Uplink Packet Access I/O Input/Output Inorm Normal Current LED Light Emitting Diode LNA Low Noise Amplifier LTE Long Term Evolution MIMO Multiple Input Multiple Output MO Mobile Originated MS Mobile Station (GSM engine) MT Mobile Terminated PAP Password Authentication Protocol PCB Printed Circuit Board PDU Protocol Data Unit
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 66 / 7 PPP Point-to-Point Protocol QAM Quadrature Amplitude Modulation QPSK Quadrature Phase Shift Keying RF Radio Frequency RHCP Right Hand Circularly Polarized Rx Receive SIM Subscriber Identification Module SMS Short Message Service TDD Time Division Duplexing TDMA Time Division Multiple Access TD-SCDMA Time Division-Synchronous Code Division Multiple Access TX Transmitting Direction UL Uplink UMTS Universal Mobile Telecommunications System URC Unsolicited Result Code USIM Universal Subscriber Identity Module Vmax Maximum Voltage Value Vnorm Normal Voltage Value Vmin Minimum Voltage Value VIHmax Maximum Input High Level Voltage Value VIHmin Minimum Input High Level Voltage Value VILmax Maximum Input Low Level Voltage Value VILmin Minimum Input Low Level Voltage Value VImax Absolute Maximum Input Voltage Value VIminAbsolute Minimum Input Voltage Value
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 67 / 7 VOHmax Maximum Output High Level Voltage Value VOHmin Minimum Output High Level Voltage Value VOLmax Maximum Output Low Level Voltage Value VOLmin Minimum Output Low Level Voltage Value VSWR Voltage Standing Wave Ratio WCDMA Wideband Code Division Multiple Access
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 68 / 7 10 Appendix B GPRS Coding SchemeTable 34: Description of Different Coding Schemes Scheme CS-1 CS-2 CS-3 CS-4 Code Rate 1/2 2/3 3/4 1 USF 3 3 3 3 Pre-coded USF 3 6 6 12 Radio Block excl.USF and BCS 181 268 312 428 BCS 40 16 16 16 Tail 4 4 4 - Coded Bits 456 588 676 456 Punctured Bits 0 132 220 - Data Rate Kb/s 9.05 13.4 15.6 21.4
0 LTE Module EC25-A User Manual EC25-A_User_Manual Confidential / Released 69 / 7 11 Appendix C GPRS Multi-slot ClassTwenty-nine classes of GPRS multi-slot modes are defined for MS in GPRS specification. Multi-slot classes are product dependant, and determine the maximum achievable data rates in both the uplink and downlink directions. Written as 3+1 or 2+2, the first number indicates the amount of downlink timeslots, while the second number indicates the amount of uplink timeslots. The active slots determine the total number of slots the GPRS device can use simultaneously for both uplink and downlink communications. The description of different multi-slot classes is shown in the following table. Table 35: GPRS Multi-slot Classes Multislot Class Downlink Slots Uplink Slots Active Slots 1 1 1 2 2 2 1 3 3 2 2 3 4 3 1 4 5 2 2 4 6 3 2 4 7 3 3 4 8 4 1 5 9 3 2 5 10 4 2 5 11 4 3 5 12 4 4 5
70 LTE Module Sires EC25 Hardware Design EC25_Hardware_Design Confidential / Released 70 / 12 Appendix D EDGE Modulation andCoding Scheme Table 36: EDGE Modulation and Coding Scheme Coding Scheme Modulation Coding Family 1 Timeslot 2 Timeslot 4 Timeslot CS-1: GMSK / 9.05kbps 18.1kbps 36.2kbps CS-2: GMSK / 13.4kbps 26.8kbps 53.6kbps CS-3: GMSK / 15.6kbps 31.2kbps 62.4kbps CS-4: GMSK / 21.4kbps 42.8kbps 85.6kbps MCS-1 GMSK C 8.80kbps 17.60kbps 35.20kbps MCS-2 GMSK B 11.2kbps 22.4kbps 44.8kbps MCS-3 GMSK A 14.8kbps 29.6kbps 59.2kbps MCS-4 GMSK C 17.6kbps 35.2kbps 70.4kbps MCS-5 8-PSK B 22.4kbps 44.8kbps 89.6kbps MCS-6 8-PSK A 29.6kbps 59.2kbps 118.4kbps MCS-7 8-PSK B 44.8kbps 89.6kbps 179.2kbps MCS-8 8-PSK A 54.4kbps 108.8kbps 217.6kbps MCS-9 8-PSK A 59.2kbps 118.4kbps 236.8kbps

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